A riser device

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/01 (2006.01) E21B 19/24 (2006.01)

Patent

CA 2402779

A riser (18) extends between a surface vessel, e.g. a drillship (16), and an item of subsea equipment, e.g. a blowout preventer valve (12) on the seabed (10). The riser (18) is equipped with at least one thruster, for instance in the form of one or more motor driven positional propellers (201, 202), which is arranged so as to be able to exert an essentially horizontal thrust force on the riser (18) in order to counteract the lateral forces from the oceanic currents, so as to maintain the riser (18) in a position that corresponds to the desired course from the surface vessel (16) to the subsea equipment (12).

L'invention concerne une colonne montante (18) située entre un navire de surface, un navire de forage (18), par exemple, et un article d'un équipement sous-marin, une soupape de bloc d'obturation (12), par exemple, situé sur le fond marin (10). Cette colonne montante (18) est équipée d'au moins un propulseur, sous forme d'une ou plusieurs hélices de positionnement actionnées par moteur (20¿1?, 20¿2?), conçu pour exercer une force de poussée globalement horizontale sur la colonne montante (18) afin de contrecarrer les forces latérales des courants océaniques, afin de maintenir la colonne montante (18) dans une position correspondant à un alignement désiré entre le navire de surface (16) et l'équipement sous-marin (12).

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